The correct answer is C) binding of pump moving parts. Uneven bolt tightening during the installation of a fuel injection pump can result in binding of the pump's moving parts. When the bolts are not tightened evenly, it can cause distortion or misalignment of the pump, leading to increased friction and resistance in the pump's internal components. This binding of the moving parts can disrupt the proper operation and timing of the fuel injection system. The other options are incorrect because: A) High torsional shock to fuel lines is not a direct result of uneven bolt tightening, but could be a consequence of other issues. B) Ignition delay is more likely caused by problems with the engine's ignition system, not the fuel injection pump installation. D) Improper pump-to-engine timing is a potential outcome of the binding of pump moving parts, but not a direct result of uneven bolt tightening.